172731000 has 256 divisors, whose sum is σ = 599639040. Its totient is φ = 41126400.

The previous prime is 172730993. The next prime is 172731017. The reversal of 172731000 is 137271.

172731000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×172731000² = 59671996722000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1676949 + ... + 1677051.

It is an arithmetic number, because the mean of its divisors is an integer number (2342340).

Almost surely, 2^172731000 is an apocalyptic number.

172731000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172731000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299819520).

172731000 is an abundant number, since it is smaller than the sum of its proper divisors (426908040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172731000 is a wasteful number, since it uses less digits than its factorization.

172731000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 172731000 is about 13142.7166141555. The cubic root of 172731000 is about 556.9165136753.

Adding to 172731000 its reverse (137271), we get a palindrome (172868271).

The spelling of 172731000 in words is "one hundred seventy-two million, seven hundred thirty-one thousand".